Gopukumar, S. and Chung, K.Y. and Kim, K.B. (2004) Novel synthesis of layered LiNi1/2Mn1/2O2 as cathode material for lithium rechargeable cells. Electrochimica Acta, 49 (5). pp. 803-810. ISSN 0013-4686

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Abstract

A new solution combustion synthesis of layered LiNi0.5Mn0.5O2 involving the reactions of LiNO3, Mn(NO3)2, NiNO3, and glycine as starting materials is reported. TG/DTA studies were performed on the gel-precursor and suggest the formation of the layered LiNi0.5Mn0.5O2 at low temperatures. The synthesized material was annealed at various temperatures, viz., 250, 400, 600, and 850 ◦C, characterized by means of X-ray diffraction (XRD) and reveals the formation of single phase crystalline LiNi0.5Mn0.5O2 at 850 ◦C. The morphology of the synthesized material has been investigated by means of scanning electron microscopy (SEM) and suggests the formation of sub-micron particles. X-ray photoelectron spectroscopy (XPS) and cyclic voltammetry (CV) studies on the synthesized LiNi0.5Mn0.5O2 powders indicate that the oxidation states of nickel and manganese are +2 and +4, respectively. Electrochemical galvanostatic charge–discharge cycling behavior of Li//LiNi0.5Mn0.5O2 cell using 1M LiPF6 in EC/DMC as electrolyte exhibited stable capacities of ∼125 mAh/g in the voltage ranges 2.8–4.3Vand 3.0–4.6Vand is comparable to literature reports using high temperature synthesis route. The capacity remains stable even after 20 cycles. The layered LiNi0.5Mn0.5O2 powders synthesized by this novel route have several advantages as compared to its conventional synthesis techniques.

Item Type:	Article
Uncontrolled Keywords:	Lithium battery; Sol–gel combustion; Layered LiNi1/2Mn1/2O2; Cathode material; Galvanostatic cycling
Subjects:	Lithium batteries Electrochemical Power Sources
Divisions:	UNSPECIFIED
Depositing User:	ttbdu cecri
Date Deposited:	05 Apr 2012 10:47
Last Modified:	05 Apr 2012 10:47
URI:	http://cecri.csircentral.net/id/eprint/937

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